Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Converging with plural inputs and single output
Reexamination Certificate
2007-02-12
2008-10-14
Richards, N. Drew (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
Converging with plural inputs and single output
C327S099000, C327S318000, C327S408000, C333S101000, C361S091100
Reexamination Certificate
active
07436238
ABSTRACT:
An integrated circuit can be switched between operating modes without the need for a dedicated mode selection pin. A circuit for operation at a specified maximum supply voltage comprises first and second supply terminals, a first signal input for application of a regular input signal, a second signal input, and an output. The circuit further comprises a multiplexer with first and second inputs connected to the first and second signal inputs, respectively, for selectively switching either of the first and second signal inputs to the output under control of a selection signal. A gate circuit provides the selection signal to the multiplexer. The input of the gate circuit is driven by control circuitry. Clamping circuitry is provided that limits the voltage at the first input of the multiplexer. With such a circuit design, a relatively high voltage applied to the first signal input will switch the circuit to another operating mode, such as a test mode.
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Elmer Werner
Jungert Horst
Brady III Wade J.
Franz Warren L.
O'Neill Patrick
Richards N. Drew
Telecky , Jr. Frederick J.
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